import datetime
import logging
import os
from dataclasses import dataclass
from typing import Any, Dict
import urllib.parse
import concurrent.futures
import requests
import json

from _types import CheckPoint, CheckPointStatus, MultipartFileReq
from common.ddb_service.client import DynamoDbUtilsService
from common.response import ok, bad_request, internal_server_error
from common_tools import get_base_checkpoint_s3_key, \
    batch_get_s3_multipart_signed_urls, complete_multipart_upload, multipart_upload_from_url
from multi_users._types import PARTITION_KEYS, Role
from multi_users.utils import get_user_roles, check_user_permissions, get_permissions_by_username

checkpoint_table = os.environ.get('CHECKPOINT_TABLE')
bucket_name = os.environ.get('S3_BUCKET')
checkpoint_type = ["Stable-diffusion", "embeddings", "Lora", "hypernetworks", "ControlNet", "VAE"]
user_table = os.environ.get('MULTI_USER_TABLE')
CN_MODEL_EXTS = [".pt", ".pth", ".ckpt", ".safetensors", ".yaml"]

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
ddb_service = DynamoDbUtilsService(logger=logger)
MAX_WORKERS = 10


# GET /checkpoints?username=USER_NAME&types=value&status=value
def list_all_checkpoints_api(event, context):
    logger.info(json.dumps(event))
    _filter = {}

    user_roles = ['*']
    username = None
    parameters = event['queryStringParameters']
    if parameters:
        if 'types' in parameters and len(parameters['types']) > 0:
            _filter['checkpoint_type'] = parameters['types']

        if 'status' in parameters and len(parameters['status']) > 0:
            _filter['checkpoint_status'] = parameters['status']

        # todo: support multi user fetch later
        username = parameters['username'] if 'username' in parameters and parameters['username'] else None
        if username:
            user_roles = get_user_roles(ddb_service=ddb_service, user_table_name=user_table, username=username)

    requestor_name = event['requestContext']['authorizer']['username']
    requestor_permissions = get_permissions_by_username(ddb_service, user_table, requestor_name)
    requestor_created_roles_rows = ddb_service.scan(table=user_table, filters={
        'kind': PARTITION_KEYS.role,
        'creator': requestor_name
    })
    for requestor_created_roles_row in requestor_created_roles_rows:
        role = Role(**ddb_service.deserialize(requestor_created_roles_row))
        user_roles.append(role.sort_key)

    raw_ckpts = ddb_service.scan(table=checkpoint_table, filters=_filter)
    if raw_ckpts is None or len(raw_ckpts) == 0:
        data = {
            'checkpoints': []
        }
        return ok(data=data)

    ckpts = []
    for r in raw_ckpts:
        ckpt = CheckPoint(**(ddb_service.deserialize(r)))
        if check_user_permissions(ckpt.allowed_roles_or_users, user_roles, username) or (
            'user' in requestor_permissions and 'all' in requestor_permissions['user']
        ):
            ckpts.append({
                'id': ckpt.id,
                's3Location': ckpt.s3_location,
                'type': ckpt.checkpoint_type,
                'status': ckpt.checkpoint_status.value,
                'name': ckpt.checkpoint_names,
                'created': ckpt.timestamp,
                'allowed_roles_or_users': ckpt.allowed_roles_or_users
            })

    data = {
        'checkpoints': ckpts
    }

    return ok(data=data, decimal=True)


@dataclass
class UploadCheckPointEvent:
    checkpointType: str
    modelUrl: list[str]
    params: dict[str, Any]


def download_and_upload_models(url: str, base_key: str, file_names: list, multipart_upload: dict, cannot_download: list):
    logger.info(f"download_and_upload_models: {url}, {base_key}, {file_names}")
    filename = ""
    response = requests.get(url, allow_redirects=False, stream=True)
    if response and response.status_code == 307:
        if response.headers and 'Location' in response.headers:
            url = response.headers.get('Location')
    parsed_url = urllib.parse.urlparse(url)
    filename = os.path.basename(parsed_url.path)
    if os.path.splitext(filename)[1] not in CN_MODEL_EXTS:
        logger.info(f"download_and_upload_models file error url:{url}, filename:{filename}")
        cannot_download.append(url)
        return
    logger.info(f"file name is :{filename}")
    file_names.append(filename)
    s3_key = f'{base_key}/{filename}'
    logger.info(f"upload s3 key is :{filename}")
    multipart_upload[filename] = multipart_upload_from_url(url, bucket_name, s3_key)


# 并发上传文件
def concurrent_upload(file_urls, base_key, file_names, multipart_upload):
    cannot_download = []
    with concurrent.futures.ThreadPoolExecutor(max_workers=MAX_WORKERS) as executor:
        futures = []
        for file_url in file_urls:
            futures.append(
                executor.submit(download_and_upload_models, file_url, base_key, file_names, multipart_upload,
                                cannot_download))

        for future in concurrent.futures.as_completed(futures):
            future.result()
    if cannot_download:
        return cannot_download
    return None


# POST /upload_checkpoint
def upload_checkpoint_api(raw_event, context):
    request_id = context.aws_request_id
    event = UploadCheckPointEvent(**raw_event)
    _type = event.checkpointType
    headers = {
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'OPTIONS,POST,GET'
    }
    if _type not in checkpoint_type:
        logger.info(f"type error:{_type}")
        return {
            'statusCode': 500,
            'headers': headers,
            'error': "please choose the right type from :"
                     "'Stable-diffusion', 'embeddings', 'Lora', 'hypernetworks', 'Controlnet', 'VAE'"
        }

    try:
        base_key = get_base_checkpoint_s3_key(_type, 'custom', request_id)
        urls = event.modelUrl
        file_names = []
        logger.info(f"start to upload models:{urls}")
        checkpoint_params = {}
        if event.params is not None and len(event.params) > 0:
            checkpoint_params = event.params
        checkpoint_params['created'] = str(datetime.datetime.now())
        checkpoint_params['multipart_upload'] = {}

        user_roles = ['*']
        creator_permissions = {}
        if 'creator' in event.params and event.params['creator']:
            user_roles = get_user_roles(ddb_service, user_table, event.params['creator'])
            creator_permissions = get_permissions_by_username(ddb_service, user_table, event.params['creator'])

        if 'checkpoint' not in creator_permissions or \
                ('all' not in creator_permissions['checkpoint'] and 'create' not in creator_permissions['checkpoint']):
            return {
                'statusCode': 400,
                'headers': headers,
                'error': f"user has no permissions to create a model"
            }

        cannot_download = concurrent_upload(urls, base_key, file_names, checkpoint_params['multipart_upload'])
        if cannot_download:
            return {
                'statusCode': 500,
                'headers': headers,
                'error': f"contains invalid urls:{cannot_download}"
            }
        logger.info("finished upload, prepare to insert item to ddb")
        checkpoint = CheckPoint(
            id=request_id,
            checkpoint_type=_type,
            s3_location=f's3://{bucket_name}/{base_key}',
            checkpoint_names=file_names,
            checkpoint_status=CheckPointStatus.Active,
            params=checkpoint_params,
            timestamp=datetime.datetime.now().timestamp(),
            allowed_roles_or_users=user_roles,
        )
        ddb_service.put_items(table=checkpoint_table, entries=checkpoint.__dict__)
        logger.info("finished insert item to ddb")
        return {
            'statusCode': 200,
            'headers': headers,
            'checkpoint': {
                'id': request_id,
                'type': _type,
                's3_location': checkpoint.s3_location,
                'status': checkpoint.checkpoint_status.value,
                'params': checkpoint.params
            }
        }
    except Exception as e:
        logger.error(e)
        return {
            'statusCode': 500,
            'headers': headers,
            'error': str(e)
        }


@dataclass
class CreateCheckPointEvent:
    checkpoint_type: str
    filenames: [MultipartFileReq]
    params: dict[str, Any]


# POST /checkpoint
def create_checkpoint_api(raw_event, context):
    request_id = context.aws_request_id
    event = CreateCheckPointEvent(**json.loads(raw_event['body']))
    _type = event.checkpoint_type
    headers = {
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'OPTIONS,POST,GET'
    }
    try:
        base_key = get_base_checkpoint_s3_key(_type, 'custom', request_id)
        presign_url_map = batch_get_s3_multipart_signed_urls(
            bucket_name=bucket_name,
            base_key=base_key,
            filenames=event.filenames
        )

        checkpoint_params = {}
        if event.params is not None and len(event.params) > 0:
            checkpoint_params = event.params

        checkpoint_params['created'] = str(datetime.datetime.now())
        checkpoint_params['multipart_upload'] = {}
        multiparts_resp = {}
        for key, val in presign_url_map.items():
            checkpoint_params['multipart_upload'][key] = {
                'upload_id': val['upload_id'],
                'bucket': val['bucket'],
                'key': val['key'],
            }
            multiparts_resp[key] = val['s3_signed_urls']

        filenames_only = []
        for f in event.filenames:
            file = MultipartFileReq(**f)
            filenames_only.append(file.filename)

        if len(filenames_only) == 0:
            return bad_request(message='no checkpoint name (file names) detected', headers=headers)

        user_roles = ['*']
        creator_permissions = {}
        if 'creator' in event.params and event.params['creator']:
            user_roles = get_user_roles(ddb_service, user_table, event.params['creator'])
            creator_permissions = get_permissions_by_username(ddb_service, user_table, event.params['creator'])

        if 'checkpoint' not in creator_permissions or \
                ('all' not in creator_permissions['checkpoint'] and 'create' not in creator_permissions['checkpoint']):
            return bad_request(message='user has no permissions to create a model', headers=headers)

        checkpoint = CheckPoint(
            id=request_id,
            checkpoint_type=_type,
            s3_location=f's3://{bucket_name}/{base_key}',
            checkpoint_names=filenames_only,
            checkpoint_status=CheckPointStatus.Initial,
            params=checkpoint_params,
            timestamp=datetime.datetime.now().timestamp(),
            allowed_roles_or_users=user_roles
        )
        ddb_service.put_items(table=checkpoint_table, entries=checkpoint.__dict__)
        data = {
            'checkpoint': {
                'id': request_id,
                'type': _type,
                's3_location': checkpoint.s3_location,
                'status': checkpoint.checkpoint_status.value,
                'params': checkpoint.params
            },
            's3PresignUrl': multiparts_resp
        }
        return ok(data=data, headers=headers)
    except Exception as e:
        logger.error(e)
        return internal_server_error(headers=headers, message=str(e))


@dataclass
class UpdateCheckPointEvent:
    status: str
    multi_parts_tags: Dict[str, Any]


# PUT /checkpoint
def update_checkpoint_api(raw_event, context):
    event = UpdateCheckPointEvent(**json.loads(raw_event['body']))
    checkpoint_id = raw_event['pathParameters']['id']
    headers = {
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'OPTIONS,POST,GET'
    }
    try:
        raw_checkpoint = ddb_service.get_item(table=checkpoint_table, key_values={
            'id': checkpoint_id
        })
        if raw_checkpoint is None or len(raw_checkpoint) == 0:
            return bad_request(
                message=f'checkpoint not found with id {checkpoint_id}',
                headers=headers
            )

        checkpoint = CheckPoint(**raw_checkpoint)
        new_status = CheckPointStatus[event.status]
        complete_multipart_upload(checkpoint, event.multi_parts_tags)
        # if complete part failed, then no update
        ddb_service.update_item(
            table=checkpoint_table,
            key={
                'id': checkpoint.id,
            },
            field_name='checkpoint_status',
            value=new_status
        )
        data = {
            'checkpoint': {
                'id': checkpoint.id,
                'type': checkpoint.checkpoint_type,
                's3_location': checkpoint.s3_location,
                'status': checkpoint.checkpoint_status.value,
                'params': checkpoint.params
            }
        }
        return ok(data=data, headers=headers)
    except Exception as e:
        logger.error(e)
        return internal_server_error(headers=headers, message=str(e))